Pulley and shaft coupling.



No. 63l,957. Patented Aug. 29, I899.

s. E. DIESCHER.

PULLEY AND SHAFT COUPLING.

(Application filed Mar. 9, 1899.) v (No Model.) 4 Sheets-Sheet FIG.E.

N0. 63l,957. Patented Aug. 29, I899.

S.-E. DIESCHER. PULLEY AND SHAFT COUPLlNG.

(Application filed Mar. 9, 1899.} (No Model.) 4 Sheets-Sheet 2WITNESSES:

gNVENTOR, Eh v Patented Aug. 29, I899.

No 63l,957.

S. E. DIESCHER.

PULLEY AND SHAFT COUPLING.

(Application filed Mar. 9, 1899.)

4 Shuets-Sheet 3.

WITNESSES:

No. 631,957. Patented Aug. 29, I899. s. E. mzscmzn.-

P'ULLEY AND SHAFT BOUPLING.

(Application filed Mar. 9, 1899.)

( MOMD 4 sheets sheet 4,

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m: "cams mam cc. mowaumon WASHINGTON. n. c.

UNITED STATES J PATENT OFFICE.

SAMUEL E. DIESOH-ER, or FITTSBURG, PENNSYLVANIA.

PULLEY AND SHAFT COUPLlNG.

SPECIFICATION forming part of Letters Patent No. 631,957, dated August29, 1899.

Application filed Marcl19, 1899. Serial n. 708,342. (No model.)

To all whom it may concern:

]3e it known that I, SAMUEL E. DIESCHER, a citizen of the United States,residing at Pittsburg, in the county of Allegheny and State ofPennsylvania, have iuventedor discovered certain new and usefulImprovements in Pulley and Shaft Couplings, of which improvements thefollowing is a specification. 1

The invention described herein relates to certain improvements inmechanism for con necting a part or member to be drivensuch as a pulley,a shaft-section, &c.-to the power or driving shaft, and has for itsobject such a construction of connecting mechanism as will not requireany special preparation of the driving-shaftsuch as cutting keyways,&c.and will permit the location of the pul ley, &c., at any desiredpoint.

In general terms the invention consists in the construction andcombination substantially as hereinafter more fully described andclaimed.

In the accompanying drawings, forming a part of this specification,Figure 1 is a side elevation of a pulley secured by my improvedmechanism to a driving-shaft. Fig. 2 is a sectional view of the same.Fig. 2 is a sectional detail, the plane of section being indicated bythe line a: as, Fig. 1. Figs. 3 and 4 are views similar to Figs. 1 and2, illustrating a modified construction. Figs. 5 and 6 are side andsectional elevations illustrating modifications in the fasteningmechanism. Fig. 6 is a detail view of the fastening or gripping member.Fig. 7 is an elevation of a clutch mechanism embodying my improvements.Fig. 8 is a sectional elevation of the same, and Fig. 9 an endelevation.

In the practice of my invention the hub 1 of the pulley is bored out soas to fit snugly around the cylindrical gripping member 2 when thelatter is in its expanded or non-operative condition. The cylindricalgripping member consists of a bar, preferably square or oblong incross-section and spirally coiled, as shown. This gripping member ismade of such internal diameter as to be capable when non-contracted ofsliding easily along the shaft. Recesses 3 are formed in the innersurface of the hub for the reception of hooks 4, adapted to engageradially-projecting ends of the gripping member. These hooks areprovided with threaded stems 5, which project out through slots3, formedthrough the wall of the hub, and connect with the recesses 3. Thesehooks are placed in position in the recesses with their stems projectingthrough the slots, and then the gripping member iscontractedsuffioiently to permit its radially-projecting ends 2 to pass into thehub and be forced into the hub until the projecting ends pass into therecesses in front of the hooks 4. The pulley is then slipped onto theshaft, and when in proper position the nuts 6 arescrewed up, therebydrawing the gripping member tightly around .the shaft and also closingthe split hub onto the outer surfaceofthe gripping member. It-will beobserved that the means employed for applying tension to the ends of thegripping member are arranged on opposite sides of the split or opening ain the hub, so that the screwing up of the nuts 6 tends to contract thehub.

It will be understood from the foregoing that it is characteristic of myimprovement that the hub is positively and frictionally engaged with thegripping member at the same time and by the same means that the grippingmember is brought in frictional engagement with the shaft.

As shown in Figs. 3 and 4:, my improved gripping mechanism can beapplied to divided or sectional pulleys; but in such case thetightening-hooks can be dispensed with, the ends of the gripping memberbeing extended tangentially, so as to project through holes in the hub.These tangential ends 7 are threaded for the reception of thetighteningnuts 6. In using this construction the gripping member isslipped onto the shaft and the pulley members placed around and securedin position by means of the bolts 8 and 9, which pass through lugs 10and 11 on the hub and rim of the pulley. After the pulley-sections havebeen secured around the gripping member the nuts 6 are screwed up,thereby causing the gripping member to tightly grip the shaft and thehub of the pulley to be drawn closely intofrictional engagement with theouter surface of the gripp'ng member. After the nuts 6 have been ti ht-I ened up the nuts on the bolts 8 and 9 are also turned up to take upany slack or looseness between the pulley-sections resulting fromtightening the nuts 6.

The construction shown in Figs. 1 to 4 necessitates .the sliding of thepulley or the gripping member onto the shaft While the shaft is out ofits bearings. As the removal of a line of shafting from its bearingsinvolves considerable labor and loss of time of machinery driven by suchline of shafting, provision is made by the construction shown in Figs. 5and 6 for the placing of pulleys on shafts without the removal of thelatter from its bearings. In this construction the grip ping member isformed by a series of concavo-convex links or sections 12, having theirends hinged or otherwise loosely connected together so as to permit thegripping member to be straightened out, as shown in Fig. 6, and thencoiled or wrapped around the shaft at the desired place. Thepulley-sections are thenclamped around the gripping member and shaft, asdescribed in connection with the construction shown in Figs. 3 and 4,and the gripping member and pulley brought into operative relation tothe shaft and to each other by screwing up the nuts on the threaded endsof the gripping member.

As shown in Figs. 7, 8, and 9, the essential parts of the mechanicaldevices forming the invention described herein may be employed as acoupling mechanism for the adjoining ends of two shaft-sections. Theseessential parts consist of an inclosing-sleeve portion 1 and a grippingmember. The sleeve portion l is split or otherwise constructed so as tobe capable of being collapsed or reduced in diametrical dimensions andforms in the construction shown in Figs. 1 to 6 the hub of the pulley.This collapsible sleeve forms opposing hearings or abutments for themeans employed in tightening the gripping memher, which consists of aflexible band coiled one or more times around the shaft.

In using my improvement as a coupler for shaft-sections it is preferred,although not necessarily essential, to form the gripping member in twosimilar parts or sections 2 and 2, both inclosed in the split orcollapsible sleeve.

Any suitable means may be employed for tightening the gripping membersaround the shaft-sections and closing the sleeve. Convenient means forefiecting this-purpose consist of hooks 4, engaging the ends of thegripping members and provided with threaded stems 5, projecting throughthe walls of the sleeve in a direction tangential to the grippingmembers.

It will be observed that the sleeve or hub is the medium through whichmovement is transmitted from the gripping member on the driving or powershaft to the pulley-rim in one case and to the shaft-section to bedriven in the other case. When used as a coupling mechanism, the sleeveor hub serves the additional function of maintaining the shaft-sectionsin alinement.

I claim herein as my invention- 1. The combination of a collapsiblesleeve, a flexible band coiled Within the sleeve, and means forsimultaneously contracting the band and closing the sleeve,substantially as set forth.

2. The combination of a pulley having a split or collapsible hu'b,'aflexible band coiled Within the hub, and means for contracting the bandand the inclosing hub, substantially as set forth.

In testimony whereof I have hereunto set my hand.

SAMUEL E. DIESOHER. Witnesses:

DARWIN S. WoLcoTT, F. E. GAITHER.

